Rule



March 9, 1937. J. KoMoRoUs RULE Filed April 19, 1935 l QN: EN w51 wm w N @man T Patented Mar. 9, 1937 UNITED STATES RULE Joseph Komorous, Riverside, Ill., alsignor to Parisian Novelty Company, Chicago, Ill., a corporation of Illinois Application April 19, 1935, Serial No. 17,317

1 Claim.

My invention relates to rules, particularly socalled slide-rules of the type comprising a base member having a scale or lscales and a slide slidable lengthwise along the base member longitu- 5 dinally thereof and having a scale or scales movable along the scale or scales on the base member.

My object, generally stated, is to provide a novel construction of such a rule and particularly one which may be made very'economically and the scale or scales on the slide of which may be easily and accurately registered with and read in connection with. the scale or scales on the base member.

Another object is to provide such a rule the slide of which may be made of flexible material, such as sheet celluloid, and of reinforced stiffened construction, to give it the desired enhanced rigidity over a dat celluloid strip and the scale or scales on the edge or edges of which will be in substantially the same plane as the scale or scales on the base member in order that proper registration of the scales may be more easily effected in adjusting the slide, and readings be accurately made.

Referring to the accompanying drawing:

Figure 1 is a face view of my improved rule construction showing the slide partially withdrawn; and

Figure 2, an enlarged transverse section taken at the line 2 on Fig. l and viewed in the direction of the arrow.

The scale according to the preferred illustrated embodiment of my invention comprises a base member III formed, as for example and preferably, of a sheet of celluloid with its longitudinal edge portions turned inwardly to the position shown to overlie, but be spaced from. the underlying portion of the sheet and form the straightedge downwardly sloping portions I I spaced apart at their adjacent edges II and which, with the underlying part of the base member. form inwardly opening grooves or channels I2 which open into a recess I3 formed between the portions II.

The rule also comprises a slide Il of flexible material, such as and preferably celluloid, the central longitudinal portion of which is upwardly and preferably vertically offset as represented at I5 throughout its length. The slide extends slidingly at its lateral portions IB in the grooves I2 and at its central portion into the space between the portions II of the base member. substantially illling the space, with the upper exposed iace of the offset portion Il substantially (Cl. 23S-70) ilush with the exposed faces of the portions I I. The vertical offset of the central portion of the slide provides shoulders 20 against which the edges II'L bear.

The edges of the portions II and the edges of 5 the offset portion I5 are provided with scales Il-I9, inclusive, as is common in constructions ot slide rules.

The exposed faces of the offset portions I5 and the edge portions II being in substantially the 10 same plane the user of` the scale in adjusting the slide I 4 may readily accurately position the graduations of thescales on the slide with the graduations of the scales on the base member and more easily read the registering markings than in l5 the case of a construction in which the scales on the slide are at a lower elevation than those on the base member.

Furthermore, the provision of the offset portion I5 stlifens the slide against distortion, per- 20 xnitting of the use of a minimum thickness of sheet material from which to make the slide and still giving the feel, in adjusting the slide, of a slide of considerably greater thickness than of the sheet material actually used.

While I have illustrated and described a particyular embodiment of my invention, I do not wish to be understood as intending to limit it thereto as the samemay be variously altered and modiiled without departing from the spirit of my in- 30 vention.

What I claim as new. and desire to secure by Letters Patent, is: y

A slide rule comprising a body member formed of celluloid sheet material having a base and hav- 35 ing its longitudinal edge portions inturned into spaced relation to form inwardly opening channels, a slide iormed of celluloid having a central portion in the same plane as the inturned edge portions of the body, and having downwardly 40 onsetlateral portions extending into the channels thereof, said offset portions having extensions at right angles thereto in a plane parallel to the plane of the base of the bock' member, whereby the central portion of the slide is provided with 45 substantially subjacent support, said inturned i edge portions sloping slightly downwards to provide a tree channel except at the inner edges, said inner edges bearing against the lateral portions oi the central member, and slide having 50 scales on the exposed faces of said edge portions and said central portions.

JOSEPH KOMOROUB. 

